1a. If you make random guesses on four multiple choice test questions (each with five possible answers), what is the probability of getting at least one question incorrect?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.8: Probabilities Of Disjoint And Overlapping Events
Problem 2C
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1. Probabilty Questions 

1a. If you make random guesses on four multiple choice test questions (each with five possible answers), what is the probability of getting at least one question incorrect?

 

1b. Seven different crime victims listened to voice recordings of four different suspects. If the voice identifications were made by random guess, find the probability that all the victims would select the same voice recording.

 

1c.  Find the probability that 3 randomly selected people all have different birthdays. Ignore leap years.

 

1d.  Find the probability that among 5 randomly selected people, at least one of them were born in March. Ignore leap years.

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